It's also a very good idea to include a summary for all of our Total Cost columns, so we get an aggregate cost estimate for the whole server. To do that with our spreadsheet example, keep in mind that the Total Cost column is listed as column F.
To add a Sum Total column to your spreadsheet on row 15, column F, enter the formula =SUM(F2:F12). If you've added more columns, substitute for column F whichever column now represents the Total Cost. Likewise, if you have more than 13 rows of different parts, use a different row to represent your summary price than row 15.
